Ledge trapping Tips for Cloud vs Jigglypuff

Position yourself in a spot near the ledge where you can react really fast against his getup option.
If he goes for the roll getup then you can either go for Rest (this will kill Cloud at 38% with no rage and at 19% with full rage) or an up-tilt (this will kill Cloud at 134% with no rage, and at 107% with full rage).

If you dont think he will go for the roll getup then you can go for a full jump Fair/Nair to hit him after his getup option or even a Dair if you feel like he is going to shield after the normal getup.